Case-insensitive match returning indices

Like base::match(), but ignores letter case. Useful for gene ID matching.

Usage

x %match% table

Arguments

x

Character vector to match.

table

Character vector of values to match against.

Value

An integer vector of match positions. Returns NA for non-matches.

Note

Both x and table must be non-empty character vectors; character(0) or non-character inputs raise an error. This differs from base::match() and %nin%, which accept empty vectors. The stricter contract is intentional for gene-ID workflows where an empty query almost always signals a upstream mistake.

Examples

c("tp53", "BRCA1", "egfr") %match% c("TP53", "EGFR", "MYC")
#> [1]  1 NA  2
# returns: 1 NA 2